Coal or book drill



' 2 Sheets-Sheet 1. Y B. A. ,LEG'G'. COAL OR ROCK DRILL.

(No Model.)

Patented Dec. 3, 1895.

(No Model.)

7 2 Sheets-Sheet 2. B. A. LEGG. GOAL OR ROCK DRILL.

No. 550,892. Patented Dec. 8, I895 A! M Z lzvenibw ANDREW B.GRANAM. FHOTOUTHOWASHINGTUN. D.C.

UNITED STATES PATENT OFFICE.

BENJAMIN A. LEGG, OF COLUMBUS, OHIO, ASSIGN OR TO JOSEPH A. JEFFREY,

OF SAME PLACE. 1

GOAL OR ROCK DRILL.

SPECIFICATION forming part of Letters Patent No. 550,892, dated December 3, 1895.

Application filed February 2, 1889. Serial No. 298,456. (No model.)

To all whom it. may concern.-

Be it known that I, BENJAMIN A. LEGG, a citizen of the United States, residing at O0- lumbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Coal or Book Drills, of which the following is a specification, reference being had therein to the accompanying drawings.

Figure 1 is a side elevation of a drill embodying my improvements. Fig. 2 is a top plan view of the same, exclusive of the frame. Fig. 3 is a front View of the master-wheel and the drillframe. Fig. 4 is a rear view of the parts shown in Fig. 1, the rear end of the transverse rectangular frame being removed. Fig. 5 is a View of the engine with the rear head removed, it showing also the supporting-arms and guides. Fig. 6 is a section 011 the line m on, Fig. 5. Fig. 7 is a plan view of the drill-frame detached. Fig. 8 is a section of the master-wheel and its engaging-gearing, taken at right angles to Fig. 6.

In the drawings, A represents the column or frame in which the operative parts of the mechanism are mounted, and this may be of any of the 110w well-known forms. I prefer to construct it as shown-that is, with an openloop frame, with screws to fasten it at the top and bottom, and with forward and upward extending projections a on the front side, forming sockets a.

B B B B indicate the drill-carrying frame, B B being the side bars and B B the end bars, the latter having an eye or ring B for guiding and steadying the drill.

b are trunnions to fit in the sockets a.

b I) b are cog-racks 011 the side bars B B. These side bars are preferably channeled, they having top flanges Z7 the racks I) being secured to said bottom flanges and bottom flanges b O O 0 refer to frame-pieces of a carriage, the side parts 0 O fitting in the channels formed in the inner faces of the side bars B B, and the cross part 0 serving as a support for the power-transinitting mechanism, there be ing a bearing at c and a cap-piece O bolted thereon.

D D D represent an engine and engineplate cast together. The parts D .D have flanges d (l to fit upon the side parts C C of the last-described frame-piece, whereby the two frames are secured together and adapted to move longitudinally of the horizontal supporting-frame through the channels formed in the side bars B B. The engine shown is a rotary engine D, having one or more interior piston-chambers E and a cylinder-wall E, together with an offset E provided with a valve-chamber E F indicates a piston, of which there may be one or more, and, as shown, it is a cylinder, secured eccentrically on the shaft F, mounted at one end of the engine in a boss E and at the other in a boss E.

G is avalve adapted to vibrate in chambers E being mounted on the shaft g is the inlet-port to chamber E g is the port through the valve and g is the exhaustport.

The operation of the engine will be readily understood. When two pistons and valves are used, they can be so arranged as to apply power alternately and preserve uniform rotation. At the front end of shaft F thereis a pinion H. It drives pinion H on stud-shaft h, which in turn drives pinion H on studshaft h. Pinion H drives the master-wheel I, having internal teeth i. It is secured to a shaft I, mounted in the aforesaid bearings at 0 under cap C The master-wheel has a cam I for effecting the feed of the drill. Shaft I has a socket c", into which the rear end of the drill-stem can be fitted.

K Kare a hub and sleeve cast integral, hub K being secured to boss E by threads. Sleeve K" supports a cross-shaft L, having feed-pinions L L fitting into the racks l) b.

By reference to the drawings it will be seen that the feed-shaft L is mounted above the plane of the bottom of the engine or motor and that its bearings are secured directly to the metal thereof or to rear wall of the engine.

As the engines or motors used in the class of machines to which my improvements relate must be small, light, and compact, it is necessary in order to generate sufficient power that they have a high speed. It is also desirable that the supporting-frame be held as steady as possible and free of jars or vibrations while the carriage is advancing and the boring or cutting apparatus is at work.

Prior to my invention it has been generally customary to support the engine or motor in a plane above the central working-plane of the carriage frame, and the vibrations and jars resulting from the cutting action are increased by the weight of the overhung parts of the engine and gearing; but by arranging the'feed mechanism on a line above the bottom of the engine or motor the pressure exerted thereby will be directly against the weight of the engine and the operative parts. It has been common to feed drilling or cutting devices of this character by means of a nut and longitudinally screw-threaded shaft. In such cases there is a cramping or binding at the nut, because of the fact that it becomes a center or fulcrum at which the vibrations and reactionary thrusts are all felt. I avoid this with a feeding mechanism of the kind here presented-namely, a relatively long transverse shaft, as at L, engaging by the two remote pinions with the racksas I thereby provide a long base of resistance to the torsional reactions when the machine is at work.

I will be seen that I arrange the engine or motor so as to have its power-shaft situated in the longitudinal planes of the machine and approximately near the central vertical plane. The continuously-rotating power-shaft has its pinion in front of the engine and the mastergear or main gearing is also in front. The crossfeed shaft L is in the rear and actuated therefrom through longitudinally-arranged power-transmitting devices. With this construction and arrangement the power parts are all compactly arranged centrally relatively to the side lines of the machine. There are no projections or obstructions at the sides of the supporting-frame to interfere with the adjusting thereof forward and back, or otherwise.

Shaft L is rotated by ratchet-toothed wheel M, which is actuated by a pawl N, secured to a sliding bar N, mounted in a sleeve-guide 0, said bar N having its front end lying in the path of the cam I on master-wheel I.

The sleeve-guide O is supported from the engine-frame D D At every revolution of the main wheel I wheel M will beadvanced one tooth. WVheel M is loose on the shaft L and can be engaged therewith at will by clutch 0, feathered on the shaft.

I am aware of the fact that heretofore use has been made of drills and engines connected thereto which were adapted to both advance and recede, together with a frame for supporting them and a bed-frame of some form to hold the frame of the drill and engine. Machines of this sort have been largely used or proposed for the undercutting of coal; but I am not aware of the use of any mechanism having the essential features which I have herein described for the drilling of a single aperture in the coal, such as is used for receiving the powder or other agent employed in blasting. The direction in which such an aperture or hole must be driven varies with almost every instance. Sometimes they are driven exactly horizontally and directly into the face, others are driven to the right or the left, while still others are driven at an inclination either upward or downward. A mechanism of the character of that herein shown can be used to accomplish these purposes. The drills that have heretofore been used for this when actuated by engines have had supplemental devices for feeding them forward, these generally being screw-threaded rods or stems. I dispense with these, and by employing the feed-rack and attaching the short feedshaft directly to the engine provide for the necessary advance and recession of the drill. The whole mechanism comprises but two portable parts namely, the upright frame on the one hand and the transverse frame and the devices attached thereto on the other hand. I thus dispense with some of the three or more parts heretofore used. It will be seen that the setting up of the machine can be readily and quickly accomplished, it being merely necessary to erect and fasten the upright and then elevate the transverse frame sufficiently to place the trunnions in the sup porting-sockets on the upright frame. The drill engines are comparatively small and light, so that one of the transverse frames and its attached parts can be readily manipulated by an operator.

I do not mean that all of the features of the present construction and arrangement of parts require the presence of a single drill only, as two or more drills or other wellknown cutting apparatus can be employed without departing from said features in the machine, such as the described arrangement of the rotary en gine or motor situated to have its prime power shaft in the longitudinal planes of the machine with the master-gearing in front and the transversely-mounted carriage-moving shaft at the 'rear and at a relatively high line.

I am aware of the fact that heretofore it has been proposed to mount an intermittinglyacting reciprocating drill and an engine for actuating the same on a movable carriage adapted to be advanced and receded on a stationary supporting-frame and such construction I do not claim; but I am not aware that prior to my invention it has ever been proposed to combine a continuously-acting drill or cutter and a rotary engine or motor, so that the rotary engine-shaft is arranged sub- 'stantially in the vertical plane and the horizontal plane of action of the cutters and to employ a transverse feed-shaft having its points of engagement with the supportingframe at the side thereof to widen the baseline of resistance to the reactionof the cutter.

WVhat I claim is- 1. The combination of the upright frame, the frame transverse thereto and pivotally supported and vertically adjustable thereon, the drill frame mounted on the said transverse frame, the drill, the engine connected to said drill-frame, the master wheel on one side of said engine, the feed-shaft on the other side of said engine, and means for trans mitting power from the master wheel to said feed shaft, said transverse frame having a rack for engaging with the said feed-shaft, whereby the engine and the drill are advanced together, substantially as set forth.

2. In a boring or cutting machine the combination of the rectangular supporting frame, rack bars arranged on said frame, a trans verse plate or carriage mounted on the supporting frame, a rotary engine or motor mounted on the carriage, and extending to points below the racks. on the supporting frame, and having its prime shaft longitudinally arranged, continuously acting boring or cutting mechanism carried by the carriage at the front thereof and extending beyond the supporting frame, a carriage feed shaft mounted in bearings formed on or secured to the engine metal above the bottom thereof, whereby the feed pressure is applied relatively high, pinions carried by said shaft at the sides of the engine and meshing with the racks 011 the supporting frame, gearing intermediate of the engine or motor and the boring or cutting apparatus, and means for transmitting power from said gearing to the pinion shaft, substantially as set forth.

3. In a boring or cutting machine, the combination with a supporting frame, having rack bars thereon, a carriage sliding on the supporting frame, boring or cutting mechanism carried by the carriage, an engine or motor mounted on the carriage and suspended to extend to points below the racks, gearing for transmitting power from the engine or motor to the boring or cutting mechanism, a transverse feed shaft journaled in bearings secured to the rear side of the engine or 1110- tor, pinions on said shaft and meshing with said racks, a loosely mounted power wheel for driving the feed shaft, means for transmitting power from the engine to the said wheel, and a clutch for connecting said wheel to said feed shaft, substantially as set forth.

4. In a boring or cutting machine, the combination with a supporting frame, of a carriage or cross plate mounted on the supportin g frame, an engine or motor on the carriage, a continously rotating master gear in front of and geared to the engine and provided with a cam, racks secured on the supporting frame, boring orcutting mechanism connected to the master gear, a transverse carriage feed shaft behind the engine, pinions on said shaft meshing with the racks on the supporting frame, a ratchet wheel 011 the feed shaft, and a rod mounted in a suitable support and having one end lying in the path of the cam on the master gear and provided near its end with a pawl adapted to engage with the teeth of said ratchet wheel, substantially as set forth.

5. In a boring or cutting machine the combination of a supporting frame, a carriage mounted on the supporting frame and having a transverse crosspiece and rearwardly extending side bars, a rotary engine or motor mounted on the rearwardly extending side bars and suspended or hung from them in a relatively low position, a rotating master gear lying between the cross bars of the carriage and having a shaft extending through a bearing in said cross piece, a continuously acting cutter connected to the shaft of said master gear, and extending beyond the supporting frame, gearing connecting the engine and the master gear, and means actuated from the engine formoving the carriage and the cutter longitudinally of the supporting frame, substantially as set forth.

6. In aboring or cutting machine, the combination of a supporting frame, having a carriage guide on lines toward and from the face of the coal, a sliding carriage mounted on the supporting frame, and moving on said guide toward and from the coal, a constantly acting cutting mechanism carried by the carriage, a rotary engine mounted on and moving with the carriage during the cutting operation and having a continuously rotating prime power shaft in the horizontal planes and the vertical planes of the cutting mechanism, gearing in front of the engine for transmitting power from the engine to the cutting mechanism, a carriage feed mechanism behind the engine, and power transmitting devices connecting the front engine gearing and the rear feed mechanism, substantially as set forth.

7.. The combination of the rectangular main frame, having a guide on lines extending toward the face of the coal, the sliding carriage thereon, the continuously acting cutting mechanism carried by the carriage, the rotary engine or motor on the carriage and between its sides and having a longitudinally arranged continuously rotating prime power shaft moving forward with the boring or cutting apparatus when the latter is in action, the gearing directly in front of the engine rotated by said power shaft and connected to the boring or cutting mechanism, a transversely mounted carriage feed shaft situated in rear of the said front gearing, means for connecting the carriage feed shaft with the main frame, and power transmitting devices connecting the said gearing in front of the engine with the rear carriage feed shaft, substantially as described.

8. In aboring or cutting machine, the combination of a supporting frame, having a guide situated on lines extending toward the face of the coal, a carriage mounted and slid ing thereon, and having a transverse cross bar and rearwardly extending side bars, a rotary engine or motor secured to said side bars and arranged in a relatively low position and having a continuouslyrotating prime power shaft situated in the longitudinal planes of the machine at or near its center, said engine or motor'and its shaft moving forward when the, cutter is in action, a pinion on said prime power shaft, a master gear wheel driven by said pinion, a cutting meehanism on the carriage actuated by the master gear, a transverse carriage moving shaft behind the front gearing, pinions on said transverse shaft, means on the supporting frame 

